Dissipation of acoustic-gravity waves: an asymptotic approach.
Dissipation of acoustic-gravity waves: an asymptotic approach.
复制标题
声重力波的耗散：渐近方法。
DOI：
10.1121/1.4902426
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
O. Godin
中科院分区：
文献类型：
--
作者：
O. Godin
中高层大气中的声重力波和次声的远距离传播受空气粘度和热导率的强烈影响。为了表征波的耗散，通常考虑允许平面波解的理想环境。本文提出了一种渐近方法，该方法依赖于环境参数的空间变化是渐进的假设。研究发现，对大气的实际假设与平面波解对波浪阻尼的预测有很大的不同。对次声吸收的Sutherland-Bass模型进行了修正。
Acoustic-gravity waves in the middle and upper atmosphere and long-range propagation of infrasound are strongly affected by air viscosity and thermal conductivity. To characterize the wave dissipation, it is typical to consider idealized environments, which admit plane-wave solutions. Here, an asymptotic approach is developed that relies instead on the assumption that spatial variations of environmental parameters are gradual. It is found that realistic assumptions about the atmosphere lead to rather different predictions for wave damping than do the plane-wave solutions. A modification to the Sutherland-Bass model of infrasound absorption is proposed.